城市防洪规划的首要问题，就是选择合理的防洪标准。
The most important problem of city flood-control planning is to choose reasonable flood-control standard.
待拆的桥梁位于城市闹区，环境复杂，拆除安全是首要考虑的因素。
The bridge to be demolished lies in downtown area of the city with complex environment.
待拆的桥梁位于城市闹区，环境复杂，拆除安全是首要考虑的因素。
The bridge to be demolished lies in downtown area of the city with complex environment.
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